From: Tejun Heo <tj@kernel.org>
To: Jeff Layton <jlayton@poochiereds.net>
Cc: Chris Worley <chris.worley@primarydata.com>,
linux-kernel@vger.kernel.org, bfields@fieldses.org,
Michael Skralivetsky <michael.skralivetsky@primarydata.com>,
Trond Myklebust <trond.myklebust@primarydata.com>,
Shaohua Li <shli@fb.com>
Subject: Re: timer code oops when calling mod_delayed_work
Date: Tue, 3 Nov 2015 19:06:58 -0500 [thread overview]
Message-ID: <20151104000658.GH5749@mtj.duckdns.org> (raw)
In-Reply-To: <20151103225405.GG5749@mtj.duckdns.org>
Hello, Jeff.
Can you please verify whether the following patch fixes the issue?
Thanks.
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 84190f0..566a282 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -970,12 +970,21 @@ EXPORT_SYMBOL(add_timer);
*/
void add_timer_on(struct timer_list *timer, int cpu)
{
- struct tvec_base *base = per_cpu_ptr(&tvec_bases, cpu);
+ struct tvec_base *new_base = per_cpu_ptr(&tvec_bases, cpu);
+ struct tvec_base *base;
unsigned long flags;
timer_stats_timer_set_start_info(timer);
BUG_ON(timer_pending(timer) || !timer->function);
- spin_lock_irqsave(&base->lock, flags);
+
+ base = lock_timer_base(timer, &flags);
+ if (base != new_base) {
+ timer->flags |= TIMER_MIGRATING;
+ spin_unlock(&base->lock);
+ base = new_base;
+ spin_lock(&base->lock);
+ }
+
timer->flags = (timer->flags & ~TIMER_BASEMASK) | cpu;
debug_activate(timer, timer->expires);
internal_add_timer(base, timer);
next prev parent reply other threads:[~2015-11-04 0:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-29 14:31 timer code oops when calling mod_delayed_work Jeff Layton
2015-10-29 17:58 ` Jeff Layton
2015-10-31 2:00 ` Tejun Heo
2015-10-31 11:34 ` Jeff Layton
2015-10-31 21:31 ` Tejun Heo
2015-10-31 21:54 ` Jeff Layton
2015-11-02 19:48 ` Chris Worley
2015-11-02 19:56 ` Jeff Layton
2015-11-03 1:33 ` Jeff Layton
2015-11-03 17:55 ` Jeff Layton
2015-11-03 22:54 ` Tejun Heo
2015-11-04 0:06 ` Tejun Heo [this message]
2015-11-04 11:48 ` Jeff Layton
2015-11-04 17:15 ` [PATCH] timer: add_timer_on() should perform proper migration Tejun Heo
2015-11-04 19:27 ` [tip:timers/urgent] timers: Use proper base migration in add_timer_on() tip-bot for Tejun Heo
2015-11-04 19:35 ` [PATCH] timer: add_timer_on() should perform proper migration Thomas Gleixner
2015-11-04 19:43 ` Tejun Heo
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